"Being an effective remedie against pustules, hives, boils and many other scrofulous conditions. This is a robust potion of powerful character. Care should be taken when brewing. Prepared incorrectly this potion has been known to cause boils, rather than cure them..."

Dangers

When brewing the potion, the cauldron must be taken off the fire before adding the porcupine quills, or, as Neville Longbottom found out, the cauldron will melt and create a horrid odour, and if it spills will cause the skin to erupt in vicious boils.[1]